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- JE l v w March 27, 1928. 1,664,151

J. BATH ET Al.

CALIPERING MECHANI SM Filed Dec. 17, 1925 I 3 Sheets-Sheet 2 5MM/Baa March 27, 192s. l 1,664,151

J. -BATH ET AL CALIPERING MECHANISM Filed Deo. 17, 1925 3 Sheets-Sheet 3 Patented Mar. 27, 1928.

UNITED STATES PATENT OFFICE.

JOHN BATH AND STANLEY W. BATH, OF WORCESTER, MASSACHUSETTS, ASSIGNORS, BY MESNE ASSIGNMENTS, TO SAID JOHN BATH.

CALIPERING MECHANISM.

Application lcd December This invention relates to a mechanism for calipering the dimensions of duplicate work and Jor giving quick and accurate readings ofthe indicated dimensions. Theinvention is capable of general application, but is pai'- ticularly adapted -to the caliperiiig of cylindrical or threaded work, such for instance as ground screw threads or taps.

.lt thegeiieral object oifour invention to provide a calipering mechanism of suoli construction thatit may be quickly applied to the work bythe operator and that it will give an accurate and much enlarged reading of the ind icatcd dii'iiensioii.

A further object s-to provide means for bringing the indicating pointer promptly to rest on the `stationary graduated scale, so that the tiine of the operator in taking readings may be economized..

(')ur `invention further relates to arrangeiii'eiits and coinbinatioiiso'f parts which w-ill` be hereinafter described and more particus.,`

lai-ly pointed out in the appended claims.

.A ire'ferred form of the invention is. shown in the drawings in which Fig. 1 isaf side elevation, partly in sec-.

tion, ot ourimproved calipering mechanism;

Fig. 2 is arfront `elevation of the calipering mechanism, looking in the direction of the arrow 2 in Fig. 1; y

VFig. 3 is a lan view oi' ythe calipering mechanism, loo ing in the direction of the* i arrow 3 in Fig. `1;

Fig. 4 is a sectional front elevation, taken along the line 4 4 in Fig. 1; `and Fig. 5 is a detail sectional elevation, taken along the line 5-5 in Fig. 2.

Referring Vto the drawings, our improved Y calipering mechanism includes a hollow casing or receptacle within and upon which the working-parts `of the mechanism are.

mounted. The casing wais-preferably provided with 4a lug orprojection 11 (Fig. 3) having a cylindrical opening 12 and a slot 13 at one side thereof. The olampin bolt 14 may be used to draw `the lug 11 about an upright-post or standard 15 (Fig. 2), thus locating the fcalipering'mechanism for the convenience of the operator. Any

17, 1925. serial No. 75,891.

other suitable support for the casing 10 may he substituted.

The casing 10 lalso has a second slotted projection or clamping portion (Figs. 1 and 3) likewise provided with a clamping' bolt or screw 21 and having a cylindrical recess 22 to receive a. slide 23. The anvil 24 of the calipering mechanism is mounted on the upper end of the slide 23 and the slide is also extended laterally to engage a guide-way 25 on the'casinir 10, by which guide-way the slide is held from angular displacement. i

The anvil 24 is held in position by a screw 26 and may be easily removed and replaced by a different anvil when desired. This is particularly necessary when calipering .threaded work of diii'erent sizes and pitch.

Tlielower end of the slide 23 is threaded internally as indicated at 27 to receive an adjusting screw 28 rotatable in a bearing 29 `supported by a lug 30 on. the casing 10. A flange 31 on the screw 28 prevents downward movement of the screw and a knurled collar 32 keyed and clamped to the lower end of thescrew28 prevents upward displacement of the screw. The screw is .thus mounted for iree rotation but is held from axial inovement. Rotation of the screw 28 thus necessarily produces vertical' movement o1" the slide 23.

After the slide is adjusted to the desired position, it is securely clamped by the binding screw 21 andconstitutes a fixed abutment dui-inv the calipering operations. A

stop 33 (Fig. 1) has a rearward extension slotted at 34 to receive binding screws 35 (Fig. 3) by which it is secured in adjusted position on the side of the casing' 10. The stop 33 serves to quickly position the work laterally, so that the movable contact element will be applied to a vertical diameter of the work.

The contact element 40 (Figs. 1 and 5) is secured to the outer end of a contact lever 41 by means of a clamping screw 42 and may be thus easily removed and replaced when desired.y The lever 41 is pivoted at 43 to the casing 10 andthe long arm 44 of casing l0.l The multiplying lever 49.hasa

long` ilepeii-`fling arm 5l i engaging-.a .pin 52 in the side oit an indicating lever 53.

The lever 53 is pivoted at 54.1,totlie casing.

l() and the pin 52 is closely adjacent to the pivot. wardly and is provided at its upper end with -a n. -oiiset end or pointer "55 Iadapted to move over graduated scale formed on the'top oi lthe casing 10. The indicating lever 53is also provided with 'aldepending `,extension 58Lon which a weight, 59 is `secured. A spring 60 (Figs. l and 4) `is ad Vjustably'eecuredto'the casing l0 by a-screw Gl `and engages v'the pin '52 `on ithe opposite 'side firoin the multiplying -ain'1r5lv`.Tl-ie eontactieleinent 4() may be'provided with a .work-engaging point 650ir any desired shape, isuitably adapted `to the work to be measured.. For calipering lthreaded work, both Itheanvil 24 and the point 65 v-willbe shaped-telit into the grooves between tlieithreadsoili the work. 'lheplate orknife --edge145 has .ieen found well suited "for accurate adjustment oit the multiplying fpower oi lthe caliperingmechanism, as a -slight change in 'thecross section outline of the vki'ii'lie edge 45 will serve to slightly vary Ythe 'effective flength of '.tlierarm 44'offvthe contact'leverl'l. -In this way tliemultiply-A ing `power of itliev lever combination may beV scale 56. f

Having V"described construction of our VVimproved `calil-)ering -mechanism, -it :is -believed that the operation thereof- Will ibe readily apparent. y The -slide 23-is iiirst iadjusted accurately l'for thewparticular wor-k to .lebe measured," thewadjustment `commonly `beingsucli'ithatwork of thevexact desired ldimensioniwill position the -pointer'55 op positehthe zero `of Vthe scale'. When a l `piece `oi" work is thereafter insertedbetween ithe n'nvil 24 and Vthe contacteleinent 40,1the element 40 will .be yyieldingly raised again-st ,pointer tothe left as viewed in Fig. l-or downwardes viewediin Fig'. 3. IIfthe work above standard size, the pointer 55 will Lassuinefsonie such 'position as :is indicated 1in', Fig. 3, but ifthe worlr is below standard lsi'ze, the pointer will jbe positionechatthe yopposite side ot itlie i zero mark.

w The weight 59 constitutes a very impor- The indicating .lever-extendslupi l :limited Vto i the details herein i disclosed other- :wh at awel. claim is casing :having I,a graduated .scale `mounted `on the upper :part ithereof, ian anvil `slid- :ably :mounted ti-hereon, means 'tos adjust 1 said Y arm extending iwthinsaid ,Casin :ingfleveripivoted .near the'topio :Asaid casing-i120 tant feature of our invention, as it acts to dampen or quickly subdue the vibrations ofV the pointer 55, so that the pointer moves quickly to the desired size indication and with very little accompanying oscillation. lhis :is oi? `substantial importance, A.as the meelianisnris particularly intended .for the taking of rapid readings by a Workman while `the .machine which .he vis attendingv continues .to operate without interruption.

Unfderthese circumstances, the period available-.tothe workman for calipering a piece of work just vcompleted is very short.

dflavingthusrdeseiribed our invention and the advantages thereof, We do not wish to be iwise than las set .forth :in ith-e claims, @but `1. icalipering mechanism :comprising ,a

anvil vertically .on :sandrasing aa movable :cont-act element, a horizontally @extending :contact liever :pivoted non said casing and supporting said contact .1 element, a `depend- ;i ng lever ipivoted i in :said casing. yand having failnterally @offset iportion `engaged bythe long end of .saidcontaetleven lanup'wardly extended pointer -pivoted :in ithelower porsaid @graduated rsscale on 'the upper portion or said casing, said-,depending lever :engag- ;tion,`: and fa spring eifeetive `.to 'yieldingly `move said s .poi'nter in the oppositel direction. L2. .fik-1caliperingmechanismiasset .forth in claim 1, in '.wliicli the pointer .is Vextended ..105

abelow rits ipivot :and `in awhich `a damping uveight.-` is mounted .onfthe depending -end l Aof said :pointer and :is -fefleetive ,to vreduce the :oscillating movements .of said.= poixrterby 4the inertia of said Weight. n

4B. .A :.calipering .mechanism eom'prising a.

casing, an .anvil fixed thereon, a .eontaet-:ele-

ment niovably-mounted :onisid casing,;.an

.indicating ipointer, :multiplying l.connections between :said Contact element and -mid i115 pointer, said connections zfcumprising a :con-

tact lever pivotediatoneside of Saidcasing at: the in pper end :thereof and ihaving; im lon ,azdepenidgand having fa rlaterally vprojecting lug -engagetli byitlie `lol'l'garm of said: Contact lever,

said pointer-mt its upper Lend, :and ka `isc-ale eoopevating 'with ssaid `pointer fand i iixed'zt fthe upperfpart-:d saideasing. w 4. In a calipering mechanism, a casing, an 30 en tion .olsaid'casing andhavingfits indicating I ,end extending xupwald tto :eo-operate with zing @raid pointer near `its ipivot andrbeing "10" iell'eet-ive fto move said :pointer-fin .one .direc-r anvil, an elongated anvil support mounted' at one side of said casing und longitudinally slidable thereon, means to prevent angular movement of said support during longitudinal adjustment thereof, means to clamp said support to said casing, an adjusting screw threaded in said support, and a bearing on said casing in which said screw is rotatably mounted but held from axial movement.

In testimony whereof We have hereunto 10 aixed our signatures.

JOHN BATH. STANLEY W. BATH. 

